The Lebesgue measure on \(\mathbb {R}^d\)  is a Radon measure. The following result is valid for any Radon measure on \(\mathbb {R}^d\) . As to the definition of a Radon measure on a topological Hausdorff space see e.g. [1]}, cf. also [2]}. A subset \(L\)  of a topological vector space \(X\)  is said to be total if the linear hull \(\langle L\rangle \)  of \(L\)  is dense in \(X\) .
